Angles, Sides & similarity ratio
math warehouse

A helpful scientific calculator that runs in your web browser window.
Holt Online Learning

All about triangles.
Tim's Triangular Page

This site shows the definition of similar polygons with the relationship of corresponding angles and how corresponsing sides are in proportion.
Math Open Reference

In this Early Edge video lesson, you'll learn more about Triangles: Perimeter and Area, so you can be successful when you take on highschool Math & Geometry.
The Princeton Review

In this Early Edge video lesson, you'll learn more about Equilateral, Isoceles and Scalene Triangles, so you can be successful when you take on highschool Math & Geometry.
The Princeton Review

In this Early Edge video lesson, you'll learn more about Triangles, so you can be successful when you take on highschool Math & Geometry.
The Princeton Review

In this Early Edge video lesson, you'll learn more about Complementary and Supplementary Angles, so you can be successful when you take on highschool Math & Geometry.
The Princeton Review

In this Early Edge video lesson, you'll learn more about Types of Angles, so you can be successful when you take on highschool Math & Geometry.
The Princeton Review

Similar triangles  sides, medians, perimeters, altitudes all in same proportion.
Math Open Reference
